Corals unhappy but parameters okay?

[Slayyyter]

My tank is a little over 2yrs old and is all softies (9 leathers some gsp and cloves) but for the past few months my leathers have been unhappy (except one who seems completely fine) and my gsp and cloves haven't grow. My parameters have stayed pretty steady the entire time so I'm not sure what im missing.
Parameters:
Sal-1.025
Ph-7.94
Temp-78.5⁰
Alk-12
Cal- 435
Mag-1275
Nitrate- 3 ppm
Po⁴- undetectable

I have an auto feeder that feeds daily and two evil clows that kill everything i add so I can increase bio load through fish. Should I try something like iodine?

 

[jimk60]

I would raise both your nitrate and PO levels. Why do you keep your ALK so high? 8 or 9 would be plenty.

 

[crazyfishmom]

High alkalinity and low nutrients tend to be problematic for most people. Agreeing with prior response and suggesting increase in nutrients and a reduction in alkalinity.

 

[jimk60]

Are you doing water changes and if so how often? Are you using a skimmer? Also wondering if your dosing based on your high ALK.

 

[Slayyyter]

Are you doing water changes and if so how often? Are you using a skimmer? Also wondering if your dosing based on your high ALK.

No skimmer and i do water changes sparingly. I dose alk and calcium so I'm lowering my dose and frequency for my alk

 

[jimk60]

I personally use neophos and neonitro when needed.